Android Engineering is aware of an issue affecting Nexus 5 users running Android 5.0 which causes significant “Miscellaneous” battery usage while WiFi is enabled. This appears to be caused by an abnormally high number of IRQ wakeup events. We are continuing to investigate this issue.

As a result, I’d expect Nexus devices — or the Nexus 5 at the very least — to see the Android 5.0 update within the next few days directly through Google. Those who want to download and install the software themselves will have to wait for the downloads to appear on the factory image.